Page 24 - Money in Energy
P. 24
ey in energy -Investment Opportunities and risks 2010
Once you've built it, tidal power is A barrage across an estuary is Tidal energy is
free. very expensive to build, the renewable. The tides
environment is changed for
many miles upstream and will continue to ebb
downstream. Many birds rely on
the tide uncovering the mud flats and flow, and the
so that they can feed. Fish can't energy is there for the
migrate, unless "fish ladders" are
installed. taking
It produces no greenhouse gases Only provides power for around
or other waste. 10 hours each day, when the tide
is actually moving in or out.
It needs no fuel.
There are few suitable sites for
It produces electricity reliably. tidal barrages
Not expensive to maintain.
Tides are totally predictable.
Offshore turbines and vertical-
axis turbines are not ruinously
expensive to build and do not
have a large environmental
impact.
5 Hydroelectric power - energy from falling water
Once the dam is built, the energy The dams are very expensive to Hydro-electric power is
is virtually free. build. renewable.
No waste or pollution produced.
However, many dams are also The Sun provides the
Much more reliable than wind, used for flood control or water by evaporation
solar or wave power. irrigation, so building costs can
be shared.
Building a large dam will flood a
very large area upstream,
causing problems for animals
that used to live there.
Water can be stored above the Finding a suitable site can be
dam ready to cope with peaks in difficult - the impact on residents
demand. and the environment may be
unacceptable.
Hydro-electric power stations can Water quality and quantity
increase to full power very downstream can be affected,
quickly, unlike other power which can have an impact on
stations. plant life.
Electricity can be generated Depends on the waves - Wave power is
constantly sometimes you'll get loads of renewable.
energy, sometimes almost
6 Wave nothing.
power
The energy is free - no fuel
needed, no waste produced.
Not expensive to operate and Needs a suitable site, where
maintain. waves are consistently strong.
24 Etree Projects Consultants Pvt Ltd.
Once you've built it, tidal power is A barrage across an estuary is Tidal energy is
free. very expensive to build, the renewable. The tides
environment is changed for
many miles upstream and will continue to ebb
downstream. Many birds rely on
the tide uncovering the mud flats and flow, and the
so that they can feed. Fish can't energy is there for the
migrate, unless "fish ladders" are
installed. taking
It produces no greenhouse gases Only provides power for around
or other waste. 10 hours each day, when the tide
is actually moving in or out.
It needs no fuel.
There are few suitable sites for
It produces electricity reliably. tidal barrages
Not expensive to maintain.
Tides are totally predictable.
Offshore turbines and vertical-
axis turbines are not ruinously
expensive to build and do not
have a large environmental
impact.
5 Hydroelectric power - energy from falling water
Once the dam is built, the energy The dams are very expensive to Hydro-electric power is
is virtually free. build. renewable.
No waste or pollution produced.
However, many dams are also The Sun provides the
Much more reliable than wind, used for flood control or water by evaporation
solar or wave power. irrigation, so building costs can
be shared.
Building a large dam will flood a
very large area upstream,
causing problems for animals
that used to live there.
Water can be stored above the Finding a suitable site can be
dam ready to cope with peaks in difficult - the impact on residents
demand. and the environment may be
unacceptable.
Hydro-electric power stations can Water quality and quantity
increase to full power very downstream can be affected,
quickly, unlike other power which can have an impact on
stations. plant life.
Electricity can be generated Depends on the waves - Wave power is
constantly sometimes you'll get loads of renewable.
energy, sometimes almost
6 Wave nothing.
power
The energy is free - no fuel
needed, no waste produced.
Not expensive to operate and Needs a suitable site, where
maintain. waves are consistently strong.
24 Etree Projects Consultants Pvt Ltd.
